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In CAM plants, the CO₂ fixed at night is stored as

(a) starch Your answer
(b) 3-PGA in the stroma Your answer
(c) malic acid in the vacuole Correct
(d) RuBP Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

In CAM plants, CO₂ fixed at night is stored as malic acid in the vacuole, and released in the day for the Calvin cycle.

Why the other options are wrong

(a) · your answer Starch is the final storage product of sugar, not the nightly CO₂ store.
(b) · your answer 3-PGA is formed in the day by RuBisCO.
(d) · your answer RuBP is the acceptor in the Calvin cycle, not a store.

NCERT point: In the Calvin cycle, the CO₂ fixed is reduced to carbohydrate using ATP and NADPH.

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